glGetTexGen : PyOpenGL 3.1.4 GL Man Pages

return texture coordinate generation parameters

Signature

glGetTexGen( )->

glGetTexGendv( GLenum ( coord ) , GLenum ( pname ) , GLdouble * ( params ) )-> void

glGetTexGendv( coord , pname , params )

glGetTexGenfv( GLenum ( coord ) , GLenum ( pname ) , GLfloat * ( params ) )-> void

glGetTexGenfv( coord , pname , params )

glGetTexGeniv( GLenum ( coord ) , GLenum ( pname ) , GLint * ( params ) )-> void

glGetTexGeniv( coord , pname , params )

Parameters

Variables	Description
coord	Specifies a texture coordinate. Must be GL_S , GL_T , GL_R , or GL_Q .
pname	Specifies the symbolic name of the value(s) to be returned. Must be either GL_TEXTURE_GEN_MODE or the name of one of the texture generation plane equations: GL_OBJECT_PLANE or GL_EYE_PLANE .
params	Returns the requested data.

Description

glGetTexGen returns in params selected parameters of a texture coordinate generation function that was specified using glTexGen . coord names one of the ( s , t , r , q ) texture coordinates, using the symbolic constant GL_S , GL_T , GL_R , or GL_Q .

pname specifies one of three symbolic names:

GL_TEXTURE_GEN_MODE: params returns the single-valued texture generation function, a symbolic constant. The initial value is GL_EYE_LINEAR .
GL_OBJECT_PLANE: params returns the four plane equation coefficients that specify object linear-coordinate generation. Integer values, when requested, are mapped directly from the internal floating-point representation.
GL_EYE_PLANE: params returns the four plane equation coefficients that specify eye linear-coordinate generation. Integer values, when requested, are mapped directly from the internal floating-point representation. The returned values are those maintained in eye coordinates. They are not equal to the values specified using glTexGen , unless the modelview matrix was identity when glTexGen was called.

Notes

If an error is generated, no change is made to the contents of params .

For OpenGL versions 1.3 and greater, or when the

ARB_multitexture

extension is supported, glGetTexGen returns the texture coordinate generation parameters for the active texture unit.

Errors

GL_INVALID_ENUM is generated if coord or pname is not an accepted value.

GL_INVALID_OPERATION is generated if glGetTexGen is executed between the execution of glBegin and the corresponding execution of glEnd .

Copyright

1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/ .

glGetTexGen